Fuse



Dec. 20, 1932. 1 URFER 1,891,291

FUSE

Filed Dec. 19, 1929 'INVENTOR. ADOLF URF'ER MW 9 19M A T T ORNE Y5.

40 i i have chosen to illustrate bayonet lugs and rotary motion is usually necessary for secur- 'ing bayonet lugs in bayonet slotsthe plug Patented Dec. 20, 19 32 UNITED STATES PATENT OFFICE AnoLr 'UBFER, or BROOKLYN, YORK, nssrenon Torronnna INSTRUMENT COMPANY, rnconronnrnn, or snoonnrn, NEW YORK, A. CORPORATION or new Y ORK rosn Application filed December 19, 1929. Serial No. 415,176.

This invention relates to fuses.

Among the objects of the invention is to provide a fuse having a simple construction which maybe easily manufactured, understood and handled.- I

Another object of the invention is to provide a fuse havingtwo separable parts, a fuse supporting element and a cover, which may be readily disassociated, and means enabling rapid and facile replacement of a fusible metallic strip.

l Vith these and incldental objects in view the invention consists of certain novel features of. construction and combination of parts, the essential elements of which are set forth in the appended claims andapres ferred formof embodimentof which is described hereinafter witlr reference to the drawing which accompanies and forms part of the specification.

In the drawing: .Fig. 1 is a longitudinal section of the fuse. Fig. 2 is ancend View of the fuse cover. Fig- 3 is a section on line 33 .of Fig. 2. Fig. dis anend view of thefuse supportingelement. I I

Fig. .5 is an elevation ofthe fuse supporting element. o

Fig. 6 is a flat piece of replaceable fuse metalas obtainable on the market. p

In its preferred form the fusehas but two separable parts, a fuse supporting element, Figs. 4 and 5 and a cover, F1gs.;2 and 3. The fuse supporting element has an enlarged portion constituting a plug 10 which may'have any crosssectional form suitable for its 1nsertion in a socket of any well known type.

11 is a pin extending through the plug 10 and it projects laterally from the sides of the plug to form two bayonet lugs, Fig.5. Since I is made in the form of a cylinder. The fuse supporting element has in addition to plug shoulder 28.

and constitute the surfaces against which the end portions of a fusible metal strip 15 contact. The fusible metallic strip is'replaceable and has the form shown in Fig. 6 before it is bent into the U-for m it possesses when mounted upon the extension 12, Fig. 1.

Passing through plug 10 are two-similarly shaped metallic strips or conductors 17, 18. The base end of the conductors are bent over against the end surface of plug 10 and are covered by spots of soft metal 19, 20. The ends of the conductors 17, 18 which leave plug 10 and extend adjacent surfaces 13, 14, respectively, are bowed at 21, 22, away from each other. The initial resiliency of the bowed portions 21, 22 is such as to possess sufiicie'nt, spring action to maintain the fusible metallic strip 15 in place.

- For enclosing the fusible metallic strip 15 a cover 23 is provided, which, when associated with -plug'lO affords a convenient means of handling the fuse at all times during the operations of inserting and removing the plug from a socket. Cover 23 is hollow, and, preferably, a'window 2 1 is provided at one end.

so that the condition of the fusible metallic strip, may be observed at all times. The end of the cover opposite the window is provided with a substantially rectangular opening 25,

Fig. 2, which is flanked by inwardly extending lips 26, 27,- These lips are so conformed as to engage the, bowed portions ofthe con ductors 17, 18 between the highest portions of the bowed portions 21, 22 and the shoulder 28 of plug 10 so as to perform the two-fold function of increasing the spring pressure of e the conductors on the fusible metallic strip 15 and to maintain the cover in its position upon the fuse supporting element against It will be noted that the conductors 17,18

afford a convenient manner of holding the cover in place as well'as support and maintain contact ;with the fusible metallic strip 15.

I its 2 cover.

The edges 29, 30, 31 and32eng'age the flat 9.?

The configuration and form of the two separable elements, the fuse supporting element and the cover, is such as to enable the manufacture of each element in one-piece in a moulding operation. Since they are made of insulation material and their forms are well suited for moulding operations, it is economic to mould them of some such material as hard vulcanized rubber or a phenolphthalic condensate. V

While I have described a preferred embodiment of my invention I desire it to be understood that I contemplate modifications and alterations within the scope of the appended claims.

'I claim:

'1. A fuse comprising a fuse supporting element having an extension, conductors mounted on said element, one adjacent each side of the extension, said conductors being bowed away from said extension but the ends of which are adapted to engage said extension and terminating short of the end of said extension, and a cap for enclosing the extension of said element and the portions of said conductors adjacent said extension so that said conductors against said extension whereby a piece of fusible metal may be held in operative position thereon. y

2. A fuse comprising, a fuse Supporting element having an extension, a pair of metallic conductors mounted on said element, said conductors being on op osite sides of said element and bowed there roni at'the extension but adapted to engage said extension with their ends, a piece of fusible metal extending from the end of one conductor to the end of the other conductor and held thereby, and a coverfor enclosing said piece of fusible metal and causing said conductors to firmly hold said piece of fusible metal in operative relation therewith; V

3. The combination set forthin claim 2 in which the cover has inwardly projecting lips adapted to engage the bowed portions of theconductors intermediate the ends of said bowed port-ion when associated with the fuse supporting element.

4. A fuse comprising, a fuse supporting element having a plug portion and an exare caused to bear porting element.

the ends of the conductors and the fuse supporting element. j

6. A fuse comprising two separable elements, a fuse supporting element including a plug and a cover, said plug being cylindrical and having means whereby it may be securedwithin a socket, a fuse supporting extension extending from said plug, conductors passing through the plug and extending on opposite sides of the fuse sup- -portingfextension, said conductors having bowed portions engageable with lips carried by said cover and the end of said bowed portions being engageable with said extension,

and means on said cover engageable with the fuse supporting element whereby relative rotary movement of the base and cover is prevented when the fuse is being mounted in a 9 socket, and whereby a piece of fusible metal may be held in operative position between the ends ofthe conductors and the fuse sup- 7. fuse comprising a element made in one-piece terial, said element having a plug'portion and an extension, a'pair ofconductors em-' fuse supporting of insulating mabedded in and held by said element,said conductors being disposed on opposite sides of said extension and passing through said plug portionythe ortions of the conductors adj acent the sides of said extension being bent outwardly and biased againstthe extension whereby a fusible metallic stri I may be supported, and means enabling the plug to be secured to a fuse supporting structureQ In testimony whereof, I hereto affix my signature. p

' ,ADOLF URFER.

tension projecting from said plug portion,

a pair of conductors having terminals at one end of the plug and extending through the plug and adjacent said extension, one'of said conductors being on one side of said extension and one on the other side of said extension, said conductors having bowed por ions terminating against said extension and their ends adapted to engage the latter, and a cover adapted to enclose said extension, said cover having means contacting the bowed portions of said conductors at points intermediate the high parts of the bows and the plug portion of the fuse supporting ele- 

